Delta Air Miles has brought back a promotion with Seattle Seahawks where Washington state residents will get free SkyMiles based on each yard accumulated by Seahawks at home or away.
SkyMiles members in Washington state are only eligible for this promotions based on the ZIP code on their account and can expect to earn in excess of 2K+ free SkyMiles out of this offer (no need to do anything besides register).
You can access this offer on dedicated website here.
Delta has been growing at Seattle at one could say at Alaska’s expense and trying to use the airport as a minihub to Asia as well.
They have had quite a few SkyMiles promotions over the past few years trying to win the “hearts” of Alaska’s frequent fliers with number of offers. Not sure how well they have worked, however.